(Reuters) - Sergio Garcia faltered as Matt Kuchar took command of the Houston Open with a four-stroke lead after the third round on Saturday. The American started the day one shot behind Spaniard Garcia, who faded with a mediocre 73 to fall into a tie for second with American Cameron Tringale (69). Kuchar has a six-shot gap on fourth-placed Matt Jones of Australia as he seeks a confidence-boosting victory heading to the Masters next week. But he is mindful that he let one get away last week at the Texas Open, where he led halfway through the final round but could only tie for fourth. More...